目前不少泵站仍使用不调速的交流电机,白白浪费了不少电能,而使用普通的变频调速,需选用高压变频器,调速较困难。针对上述现状,给出了一个主电路为交-交变频器,采用定子磁场定向的矢量控制双馈调速系统,给出了系统控制框图和控制部分主程序流程图,且用MatLab/Simulink软件对整个系统建立了仿真模型,并给出了仿真波形。仿真试验结果表明该调速系统定子电流谐波小,控制精度高,动态响应快,工作性能稳定;而且当所需调速范围不大时,可大大减小变频器容量从而显著降低成本,因此在泵站电机调速改造中具有广阔的应用前景。

The alternating current dynamo with invariable speed is used in many pumping stations at present, which wastes lots of electric energy, but the common speed regulation is relatively difficult due to the high-voltage. In order to solve the problem above,we provided a doubly-fed speed regulation system. An AC/AC cycloconverter was taken as main circuit, and the vector control of stator magnetic field orientation was adopted in this system. Besides,we provided the block diagram and flow chart of main program for control part of the system, and simulated the overall system by MatLab/Simulink, and obtained the simulation waveform. The simulation results indicate that the speed regulation system has small harmonic stator current, high control precision, quick dynamic response and stable working performance. In addition, the capability of frequency converter can be decreased largely and the costs are reduced dramatically with limited speed range, so the system has broad application prospect in the speed regulation of pumping station motor.